The answer is $2.25
I would use this proportion
24 / 3 18/x
18 times 3=54
54 divided by 24=2.25
X=$2.25
349800 :) Move the decimal place 4 places
Y = sit ups, x= days
y= 2x + 15
33 = 2x + 15 (subtract 15 from both sides)
18 = 2x (divide both sides by 2)
9 = x, 9 days
54 <_ 9x
Divide both sides by 9, sign flips
6 >_ x (same as choice B)
I apologize if the symbols make no sense, the typing keyboard has little variety.